@Judith - I think we would make a technology to help us with that. Like they said in the video, we no longer grow thick coats of hair because we hunt and kill other animals and wear their coats so we don't need to grow one, etc.

We are evolving all the time, we had better be or we are dead in the water. I would love to see how we evolve in order to be a space travelling race, can you imagine the changes we need to be better adapted to space travel - gretaer radiation resistance alone would force a change in how we reproduce !

At least as important (and quite possibly a lot easier) would be resistance to the negative effects of prolonged freefall ("zero g" or "microgravity").